<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>省市的二级联动</title>
	</head>
	<body>
		<select id="province">
			<option value="-1">省份</option>
		</select>
		<select id="city"> 
			<option value="-1">城市</option>
		</select>
		<script src="3-7.js"></script>
	</body>
</html>
